noun, plural or·thos·ti·chies. Botany.
a vertical rank or row.
an arrangement of members, as leaves, at different heights on an axis so that their median planes coincide.
Origin of orthostichy
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
noun plural -chies
an imaginary vertical line that connects a row of leaves on a stem
an arrangement of leaves so connected
Word Origin for orthostichy
C19: from ortho- + Greek stikhos line
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012